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Supporting Financial Information - Equipment and Improvements, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Furniture and equipment $ 958   $ 958   $ 958
Computer equipment 1,212   1,212   1,171
Computer software 4,353   4,353   4,341
Leasehold improvements 1,595   1,595   1,595
Total equipment and improvements 8,118   8,118   8,065
Less accumulated depreciation and amortization (5,525)   (5,525)   (4,726)
Equipment and improvements, net 2,593   2,593   $ 3,339
Depreciation expense $ 400 $ 600 $ 800 $ 1,200